JP4095033B2 - Centerline identification method and system in parking guidance system - Google Patents

Abstract

The present invention achieves an accurate and quick centreline identification in a docking guidance system and further a verification of a centreline configuration. Heretofore, it is proposed to scan an apron in front of a docking stand with a range finder and to register a reflection intensity and position for each scanned point. Then, a centreline (14) is identified in front of the docking stand by using differences in reflection intensity between the centreline (14) and the apron surface surrounding the centreline (14). Further, at least two centreline definition points (38,40) are defined in compliance with the centreline layout. <IMAGE>

Description

Field of Invention

  The present invention relates to identification of a center line in a parking guidance system, and more particularly, to a center line setting in a parking guidance system capable of quickly and appropriately processing the setting of the center line.

Background of the Invention

  In recent years, the amount of air traffic, including take-off and landing and aircraft ground movement, has increased significantly. In addition, the number of ground support vehicles required to carry cargo and passengers, provide catering services, or provide aircraft maintenance and support at airports is also increasing. With a substantial increase in ground traffic, there is a need to increase control capability and safety when aircraft are identified and docked at take-off and landing fields. Conventionally, in order to achieve a safe and accurate guidance when an aircraft is parked in an aircraft stand, a visual parking guidance system (also referred to as a visual docking guidance system (VDGS system)). Have been used). Importantly, the information the aircraft pilot receives from the visual parking guidance system is accurate enough to guide the aircraft to the correct stop position with minimal risk of colliding with obstacles on the apron. Is necessary.

  FIG. 1 shows a typical environment in which such a parking guidance system is applied. Typically, the aircraft 10 approaches a terminal building 12 that is located next to an airfield. A centerline 14 is provided to accurately guide the aircraft 10 to an aircraft stand 16 (which may be located on the apron when passengers are transported by bus). The center line 14 is painted with stop positions 18 for various aircraft types guided to the aircraft stand 16 and possibly a stand ID. Alternatively, the stand ID may be shown on a sign installed on the wall of the terminal building. Near the aircraft stand is a tracking system 22 that functionally displays guidance information for pilots of the aircraft 10 on a display 24.

  More specifically, the tracking system 22 shown in FIG. 1 identifies the aircraft 10, verifies the aircraft identification information, and tracks the aircraft to the aircraft stand 16. As the aircraft 10 lands on the airfield, the control tower 28 immediately notifies the tracking system 22 that the aircraft is approaching the aircraft stand 16 and the expected aircraft type (eg, B747).

  The tracking system 22 then continuously scans the apron in front of the aircraft stand 16 until it identifies the aircraft 10 and confirms that the type is correct. The tracking system 22 then tracks the aircraft 10 to the stop position 18 and also tracks the lateral position relative to the centerline 14 as information to the pilot of the aircraft 10.

  The distance and lateral position are displayed on the display 24 so that the aircraft pilot can correct the aircraft position while approaching the aircraft stand 16.

  When the aircraft 10 reaches its stop position 18, this is also shown on the display 24 so that the pilot can stop the aircraft. Thus, when the aircraft 10 is stopped, the aircraft is in a precise position relative to the aircraft stand 16 and the need for ground staff to adjust the stand equipment relative to the aircraft is minimal.

  Typically, the center line 14 shown in FIG. 1 is a yellow line painted on the apron leading to the aircraft stand 16. The center line 14 is arranged so that the risk of collision when the aircraft 10 moves on the ground is minimized. Because the pilot's field of view of the aircraft 10 is limited, the pilot may not be able to see the centerline 14 while the aircraft 10 is approaching the stop position 18. Thus, the pilot may rely entirely on guidance provided by the visual parking guidance system. For this reason, the accuracy with which the aircraft 10 can be guided along the centerline 14 by the visual parking guidance system is extremely important for safety.

  When the visual parking guidance system 22, 24 is installed in the aircraft stand 16, the parameters that define the position of the centerline 14 relative to the visual parking guidance system 22, 24 are adjusted for that particular aircraft stand 16. In other words, setting and / or calibration needs to be done.

  The position of the center line 14 is defined by an angle and a distance to a so-called center line definition point on the center line 14 with respect to the position of the tracking system. These centerline definition points are defined by the operator of the visual parking guidance system so that the centerline placement, orientation, and topology are correctly modeled.

  When the centerline is straight, it is sufficient to define two centerline definition points, i.e. points with appropriate spacing on the centerline 14. On the other hand, when the center line 14 is bent in the horizontal direction and / or the vertical direction, it is necessary to define a large number of center line definition points.

  FIG. 2 shows in more detail how to achieve this function with a calibration photo in which the distance is shown using different gradations of different colors as the distance from the aircraft stand increases.

  The example shown in FIG. 2 relates to a visual parking guidance system based on, for example, a laser range finder that produces a laser beam that is directed in various directions by a scanning mechanism within the visual parking guidance system.

  In this case, the position of each point in front of the visual parking guidance system is defined through two angles α and β, where the first angle α represents a vertical inclination with respect to a straight horizontal plane and the second angle β is defined for a vertical plane, eg, a plane that runs straight through the tracking system and onto the apron. Furthermore, the third value d represents the distance between the tracking system 22 and the point.

  Obviously from the above, the visual parking guidance system should be installed after the installation of a new visual parking guidance system or after the maintenance if the reference direction of the scanning mechanism may be affected by the maintenance. Must be set. Furthermore, since the functions of the visual parking guidance systems 22 and 24 are extremely important for safety, it is important that the setting of the center line is achieved with sufficient accuracy.

  By representing each scan point on the apron for the tracking system 22 of the visual parking guidance system as described above, the position of each scan point relative to the tracking system 22 is reflected, as shown at the bottom of FIG. Echo photograph (hereinafter also referred to as a centerline identification photograph or a calibration photograph for the same meaning) can be derived. This photograph can be displayed on a computer screen using different colors, for example.

  Specifically, the different distance ranges 28, 30, 32 in front of the terminal aircraft stand 16 are indicated, for example, by different colors or shades on the display used when setting up the visual parking guidance systems 22, 24. ing. Accordingly, a three-dimensional echograph is created by scanning the area in front of the aircraft stand 16. In this echograph, the third dimension, ie the distance to the object or scan point in front of the visual parking guidance system, is represented by different gray shades or different colors as outlined above.

  FIG. 3 shows a calibration photograph according to FIG. 2 when a reflective reference object 34 is placed on the apron in front of the aircraft stand.

  As shown in FIG. 3, reflective objects 34 (typically large plates) are placed at different points on the centerline 14 to define the corresponding centerline definition points. Each arrangement of the reflective object 34 is visually identified in the centerline identification photograph as shown in FIG. 3, and the midpoint 36 set at the lower end of the reference object 34 is set to the centerline definition point. Can be referenced for the purpose of defining. The measured angle and distance to this centerline definition point can be stored for future reference to this point.

  However, a problem with this method known in the art is that it is difficult to identify the boundary between the reference object, i.e. the plate and the apron, for example when the apron is wet during bad weather conditions. As a result, this method can be time consuming.

  Furthermore, since the reference object is generally large (on the order of 1 m × 1 m) so that it can be clearly seen in the calibration photograph, the defined centerline definition point, ie the midpoint 36 at the lower end of the reference object, is There is a risk of being located above the reference object rather than being located on the actual boundary with the line 14.

  Thus, at the beginning of the setup, there is an error in the angle and distance to the visual parking guidance system stored for each centerline definition point. Clearly, this directly affects the guidance accuracy achieved by the visual parking guidance system.

  Yet another problem with the known method is that because of the large reference object, special measures to maintain the reference object in place during the setting of the visual parking guidance system during heavy wind conditions or an increase in maintenance staff is required.

Summary of the Invention

  In view of the above, an object of the present invention is to achieve quick and proper centerline identification in parking guidance systems.

  Yet another object of the present invention is to achieve a quick and accurate confirmation of the settings of centerlines that have already been identified.

  According to a first aspect of the present invention, this object is a method for identifying a centerline in a parking guidance system, wherein an apron in front of an aircraft stand or parking stand is scanned by a range finder, each scanning point Registering the reflection intensity and position of the vehicle and identifying the center line in front of the parking stand by using the difference in reflection intensity between the center line and the apron surface surrounding the center line Achieved by:

  Thus, according to the invention, in addition to the angle and distance to different scanning points, in particular the centerline definition point selected to define the centerline in a visual parking guidance system, for example the color on the apron It has been proposed to use the reflectance characteristics of the centerline being painted and the surrounding apron surface.

  In other words, according to the present invention, a three-dimensional picture of the apron in front of the visual parking guidance system is created, in which the reflection intensity, more precisely the amplitude of the echo, i.e. from the scanning point or reflective object, is created. The amount of energy of the reflected beam constitutes a third dimension that can be displayed, for example, by shading or color. Thus, for any scanning point or reflective object on the apron, the difference between the distance to the scanned object and the distance to the apron surface is large if the difference in reflection characteristics between this point or object and the surrounding surface is large. Is small and can be identified in the calibration photo even if it is zero.

  According to a preferred embodiment of the present invention, the method of centerline identification includes the further step of defining at least two centerline definition points as a function of the centerline geometry.

  According to this preferred embodiment of the invention, the use of a large reflective object, for example the reflective plate mentioned above in connection with FIG. 3, when the yellow centerline itself is recognizable in the calibration picture It is possible to avoid. In this case, the center line definition point can be defined by selecting a point located on the center line. The associated vertical and horizontal angles and distances can then be stored for future reference.

  According to another preferred embodiment of the present invention, the method of centerline identification includes the further step of comparing a predefined centerline definition point with the centerline geometry.

  According to this preferred embodiment of the invention, after installation of the parking guidance system, for example, after a predetermined operating time or after maintenance of the visual parking guidance system, to confirm the existing centerline. In addition, it has been proposed to generate an identification photograph of the center line during the subsequent operation period.

  This confirmation is easily achieved, for example, by re-generating the centerline identification picture on the display screen and then overlaying the centerline definition points previously generated by the previous centerline settings. That is, when the centerline definition point stored in advance is superimposed on the newly generated centerline identification photograph, and the former centerline definition point completely matches the newly identified centerline, It is concluded that the centerline setting is accurate.

  Otherwise, i.e. when the pre-stored centerline definition point in the newly generated photo is located beside the identified centerline or in the photo indicated by the superimposed definition point When the distance to the point is different from the stored distance, a new visual parking guidance system needs to be set up.

  According to another preferred embodiment of the invention, the identification of the centerline in front of the parking stand is automatically achieved based on the difference in reflection intensity between the centerline and the apron surface around the centerline. It has been proposed.

  This preferred embodiment of the invention is particularly suitable when the centerline is painted in a bright color on the apron, e.g. yellow as usual. In this case, centerline identification can be accomplished automatically using well-known pattern recognition methods associated with centerline identification photographs.

  According to yet another preferred embodiment of the present invention, it is proposed to place at least two highly reflective reflective objects on the centerline before scanning the apron if the centerline cannot be recognized. .

  In this case, the high reflectance means that the reflectance is higher than the reflectance of the surface around the center line. Such a highly reflective object can be detected with high accuracy when the echo amplitude is used, more or less regardless of its size, and therefore may be considerably smaller than the previously used reflective objects described above. .

  In addition, these small reflective objects are easily noticeable to the surrounding apron due to their high reflectivity, so that the above-mentioned problems with the plates used in known methods are also due to their small surface, For example, problems relating to setting accuracy and handling of strong wind conditions are avoided.

  Overall, the method of the present invention identifies the centerline faster and more accurately, and therefore uses a visual parking guidance system both with and without the use of highly reflective reference objects. It is possible to set more quickly with higher accuracy. When using the reflectance parameter as an additional dimension when scanning the apron, the centerline can be more easily defined, so that the centerline identification photograph can be more easily generated and processed automatically. For this reason, centerline identification and visual parking guidance system setup can be performed more frequently, which also improves the overall safety provided by the visual parking guidance system. .

  According to a second aspect of the invention, the object outlined above is a centerline identification system for a parking guidance system, comprising: a scanning device adapted to scan an apron in front of a parking stand; By using the difference in reflection intensity between the registration device, which is adapted to register the reflection intensity and position of each scanning point, and the apron surface around the center line, the parking stand It is also achieved by a centerline identification system comprising a processing device adapted to identify a previous centerline.

  According to a preferred embodiment of the centerline identification system of the present invention, the processing device is further configured to define at least two centerline definition points according to the arrangement shape of the centerline, or a predefined centerline. The definition point is compared with the arrangement shape of the center line.

  Accordingly, the same advantages outlined above in connection with the method of the present invention are also achieved by the centerline identification system of the present invention.

  Yet another advantage of the centerline identification system of the present invention is that it simply upgrades the associated processing equipment without changing hardware, for example by either hardware or software, or a combination thereof. Can be easily implemented using the infrastructure of the existing visual parking guidance system.

  According to another preferred embodiment of the present invention, a computer program product that can be loaded directly into the internal memory of a parking guidance system processor, when the product is executed on the parking guidance system processor. A computer program product is provided comprising software code portions for performing the steps according to the method of the invention.

  Thus, the present invention also accomplishes the implementation of the method steps of the present invention on a computer or processor system. In conclusion, such an implementation leads to the provision of a computer program product for use in a computer system, more specifically a processor included in a visual parking guidance system, for example.

  The program defining the functions of the present invention is not limited to the following, for example, but is a writable storage medium (for example, a read-only memory device such as a ROM or a CD ROM disk readable by a processor or computer I / O peripheral device) Permanently stored in a computer, information stored in a writable storage medium (ie, floppy disk and hard disk), a computer via a modem or other interface device through a communication medium such as a network, telephone network or the Internet It can be distributed to computers / processors in many forms, such as information communicated to / processors. It should be understood that such a medium is an alternative embodiment of the present invention if it retains processor readable instructions that implement the concepts of the present invention.

  In the following, the best mode for carrying out the present invention and its related preferred embodiments will be described with reference to the accompanying drawings.

  The best mode for carrying out the present invention and related preferred embodiments will be described below with reference to the drawings. Where reference is made to the same parts and components already mentioned above in connection with FIGS. 1-3 above, the same reference numerals are used and repeated description thereof is omitted.

  FIG. 4 shows a centerline identification photograph in which the reflection intensity is displayed according to the present invention.

  The centerline identification photograph displays the reflection intensity as a function of the horizontal and vertical scan angles. The higher the reflection intensity, the brighter the shade of gray. There is no distance information in the picture itself, but the distance to a specific point can be obtained by, for example, placing the cursor on the point on the computer display and clicking. The distance to that point can then be shown in another display window of the computer display.

  As shown in FIG. 4, according to the present invention, in order to generate a centerline identification photograph, not only the vertical and horizontal angles and distances to the scan point are considered, but also the visual parking guidance systems 22,24. It has been proposed to measure the amplitude of the echo reflected in the direction as a further measurement dimension.

  The result of this method is shown in the lower part of FIG. As can be seen from the figure, this centerline identification photograph shows not only the reflective object 34 but also the centerline 14, the stop position 18, the stand ID 20, and the off-limit area in front of the aircraft stand 16. Have

  As can be seen from the lower part of FIG. 4, by using the amplitude information, it is no longer necessary to set up a visual parking guidance system using the large reflective object 34 described above in relation to the prior art.

  On the other hand, the display information having a one-to-one relationship with the center line on the apron, the stop position, the ID stand, the no entry area, and the like can be directly referred to, so that the measurement accuracy is increased.

  One possible method is that after the centerline identification photo is displayed on the screen, at least two centerline definition points 38, 40, eg, by a bi-directional input / output device (eg, mouse, touch screen, light pen, etc.). Is to mark

  Next, the positions of the centerline definition points 38 and 40 can be stored and referred to when a centerline identification photograph is generated again for the purpose of confirmation at a later time. In this case, it is possible to read the centerline definition points 38 and 40 and superimpose these points on the regenerated centerline identification photograph.

  As shown on the left side of FIG. 5, the positions of the centerline definition points 38 and 40 stored in advance coincide with the centerline 14, that is, the centerline photo shows the definition points 38 and 40 stored in advance. As such, when the distance measured at these points matches the pre-stored value, it is clear that the visual parking guidance system is still set or calibrated.

  Otherwise, as shown on the right side of FIG. 5, when the centerline definition points 38, 40 and the centerline 14 do not match, a visual parking guidance system is provided, for example, in the maintenance or in the system. Obviously, it is no longer set or calibrated due to other changes in the hardware or software being installed.

  FIG. 6 summarizes the example shown in connection with FIGS. 4 and 5 in the flowchart of the centerline identification method according to the present invention. Specifically, this flowchart shows the first set of steps to be taken to quickly and properly set up the visual parking guidance system.

  As shown in FIG. 6, first, step S <b> 1 is executed, and the apron in front of the aircraft parking stand 16 is scanned by the range finder 22 to register the reflection intensity and position of each scanning point. Next, step S2 is performed to identify the centerline 14 in front of the aircraft parking stand by the difference in reflectivity between the centerline 15 and the surrounding surface on the apron. Thereafter, step S3 (option) is executed to set the centerline by defining at least two centerline definition points 38, 40 on the centerline 14.

  FIG. 7 shows a flowchart of the centerline setting confirmation method according to the present invention shown in relation to FIGS. Since steps S1 and S2 of this method are the same as the initial setting of the visual parking guidance system, these steps will not be repeated.

  As shown in FIG. 7, when confirming the setting, a further step S4 is executed. For example, the center line definition points 38 and 40 and the center line 14 are superposed and examined as shown in FIG. Is compared with at least two centerline definition points 38 and 40 of the centerline 14 set previously.

  Optionally, when the deviation between the centerline placement shape or direction and the centerline definition point exceeds a predefined threshold, in step S5, the visual parking guidance system is set or calibrated again. Thus, the visual parking guidance system is returned to a proper operation state.

  The procedure described above in connection with FIG. 7 can be performed manually after an alarm from the system, for example, or automatically according to preset criteria.

  Also, it should be noted that the predefined threshold is a parameter that can be freely selected for the purpose of setting the centerline according to the present invention. Further, for the purpose of newly setting up a visual parking guidance system, a new centerline definition point can be easily defined based on a new centerline identification photograph for subsequent operation of the visual parking guidance system. The second method is to define the newly defined centerline definition from the position of the predefined centerline definition point so that the coordinate transformation can be calculated during the subsequent operation of the visual parking guidance system. Defining transformations that map to points.

  FIG. 8 is a further modification of the present invention and shows a case where a centerline identification photograph is generated with a reflective object placed on the centerline.

  As shown in FIG. 8, according to a preferred embodiment of the present invention, it is proposed to place reflective objects 42 and 44 with high reflectivity on the centerline 14 before scanning the apron. A typical outer dimension of such a reflective object can be a maximum width of 0.5 m and a maximum height of 0.5 m. In this method, for example, the centerline can be easily set under difficult measurement conditions such as when the centerline is worn or when rubber of an aircraft tire adheres to the centerline. In any case, the center line definition point on the center line 14 can be accurately and reliably defined by providing a reflective object having a high reflectance.

  FIG. 9 shows a schematic diagram of a centerline setting system according to the present invention.

  As shown in FIG. 9, the centerline setting system is divided into a visual parking guidance system having a tracking system 22 and a display device 24, and a processing / control device 62. The tracking system 22 includes, for example, a beam range finder 46 that generates a laser beam, which is reflected by a first mirror 48 and a second mirror 50 for the purpose of scanning the apron. Each of the first mirror 48 and the second mirror 50 is driven by a first step motor 52 and a second step motor 54, respectively.

  In addition, the visual parking guidance system includes a display device 24 that displays the aircraft type 56, lateral deviation 58, and distance 60 to the stop position.

  As shown in FIG. 9, both the tracking system 22 and the display device 24 of the visual parking guidance system may be a computer or dedicated processor 62 that accesses a storage medium 64 provided either internally or externally, or It operates under both controls.

As shown in FIG. 9, the processing / control unit 62, during the apron's initial scanning process, both the horizontal angle α _i and the vertical angle β _i , the associated distance d _i, and the associated intensity measurement I _i. Is adapted to control the tracking device 22 such that the scan data 1 is generated. Furthermore, α _i , β _i , d _{i of the} centerline definition points are also stored in the storage medium. This data is generated by, for example, an operator of the centerline setting system operating an I / O device such as a mouse, a touch screen, or a touch pen after the centerline identification photograph is displayed on the display screen of the control / processing device 62. Generated.

Also, as shown in FIG. 9, after the apron is scanned first and the associated centerline definition points are defined, the apron is scanned a second time or more to confirm the centerline settings. It is necessary to generate a series of new data α ′ _i , β ′ _i , d ′ _i and I ′ _i related to the centerline identification photograph.

  However, after the second scan of the apron, the centerline definition point is not repeatedly defined, but using data relating to the centerline definition point generated during the first scan of the apron, for example, As outlined with reference to FIG. 5, it is displayed superimposed on the screen of the control / processing device 62 to evaluate the match or mismatch with the centerline definition point.

  So far, the present invention has been described based on the preferred embodiment considered to be the best mode, but obviously a person skilled in the art can devise and devise many variations and variations.

  For example, in the above, two centerline definition points are referenced, but obviously any number of centerline definition points can be used if it is suitable to define the direction of the centerline in three dimensions. Centerline setting and / or calibration.

  Furthermore, the present invention can be implemented in software, hardware, or a combination thereof, depending on the available general-purpose components and dedicated hardware.

  Furthermore, laser beam rangefinders are mentioned, but obviously suitable scanning methods well known in the art such as, for example, microwave, ultrasonic scanning, infrared scanning, etc. are well covered by the present invention.

  Furthermore, while the present invention has been described above with respect to a single centerline, clearly the same method and features outlined above can be used to set up or calibrate multiple centerlines before an airport stand, or It can also be applied to both.

1 illustrates an exemplary embodiment to which a parking guidance system is applied. FIG. 2 shows a centerline identification photograph in which distances are indicated using different gray levels or colors as the distance from the aircraft stand shown in FIG. 1 increases. FIG. 3 shows a centerline identification photograph according to FIG. 2 with a reflective object placed on the apron in front of the aircraft stand. Fig. 4 shows a centerline identification photograph displaying reflection intensity according to the present invention. Fig. 5 shows an example of the definition of the center line setting and the confirmation of the center line setting according to the present invention. 3 shows a flowchart of a centerline identification method according to the present invention. 4 shows a flowchart of a centerline setting confirmation method according to the present invention. FIG. 6 shows a disposition of a reflective object on a center line and a center line identification photograph displaying reflection intensity according to the present invention. FIG. 1 shows a schematic diagram of a centerline setting system according to the present invention.

Claims (15)

A method for identifying a center line in a parking guidance system,
a) scanning the apron in front of the parking stand (16) with the distance measuring device (22), and registering the reflection intensity and position of each scanning point (S1);
b) identifying the center line in front of the parking stand (16) by using the difference in reflection intensity (S2);
c) defining at least two centerline definition points (38, 40) according to the arrangement shape of the centerlines (S3) ;
Including methods. A method for identifying a center line in a parking guidance system,
a) scanning the apron in front of the parking stand (16) with the distance measuring device (22), and registering the reflection intensity and position of each scanning point (S1);
b) identifying the center line in front of the parking stand (16) by using the difference in reflection intensity (S2);
c) comparing (S4 ) a predefined centerline definition point (38, 40) with the identified centerline (14) ;
Including methods. Re-setting the parking guidance system when a deviation between the identified centerline and an existing centerline definition point exceeds a predetermined threshold (S5) The method of claim 2 , comprising: The method of claim 3 , wherein the step of reconfiguring the parking guidance system comprises redefining at least two centerline definition points according to the identified centerline (14). . A method for identifying a center line in a parking guidance system,
a) scanning the apron in front of the parking stand (16) with the distance measuring device (22), and registering the reflection intensity and position of each scanning point (S1);
b) identifying the center line in front of the parking stand (16) by using the difference in reflection intensity (S2);
Including
Further including METHODS placing at least two reflective object of high reflectivity (42, 44) on the centreline (14) before scanning the apron. Method according to claim 5 , characterized in that the reflective object (42, 44) is a highly reflective plate with a maximum width of 0.5 m and a maximum height of 0.5 m. The identification of the centerline (14) in front of the parking stand (16) is achieved using the difference in reflection intensity between the centerline and the apron surface around the centerline (14). The method according to any one of claims 1 to 6 , characterized in that: The method according to any one of claims 1 to 7 , characterized in that the identification of the centerline (14) is achieved automatically. A center line identification system for a parking guidance system,
a) a scanning device (22) adapted to scan the apron in front of the parking stand (16);
b) a registration device (64) adapted to register the reflection intensity and position of each scanning point;
c) a processing device (62) adapted to identify the centerline (14) in front of the parking stand (16) by using the difference in reflection intensity;
With
Pre Symbol processor (62) is, according to the arrangement shape of the center line is adapted to define at least two centreline definition points (38, 40), the centreline identification system. A center line identification system for a parking guidance system,
a) a scanning device (22) adapted to scan the apron in front of the parking stand (16);
b) a registration device (64) adapted to register the reflection intensity and position of each scanning point;
c) a processing device (62) adapted to identify the centerline (14) in front of the parking stand (16) by using the difference in reflection intensity;
With
Pre Symbol processor (62) is adapted to compare the pre-Defined centreline definition points (38, 40) identified center line, the center line identification system. The processing unit (62) resets the parking guidance system when a deviation between the identified centerline and an existing centerline definition point exceeds a predetermined threshold. The system according to claim 10 , characterized in that: The processor (62) is adapted to reset the parking guidance system by redefining the at least two centerline definition points according to the identified centerline arrangement shape. The system according to claim 11 . The processing device (62) uses the difference in reflection intensity between the centerline and the apron surface around the centerline to identify the centerline (14) in front of the parking stand. The system according to any one of claims 9 to 12 , characterized in that 14. The processing device (62) according to any one of claims 9 to 13 , characterized in that the processing device (62) is adapted to automatically identify a center line (14) in front of the parking stand. system. A computer program product directly loadable into the internal memory of the processor of parked guidance system, said when the product is executed on a processor of parked guidance system, any of claims 1-8 1 A computer program product comprising a piece of software code for performing the steps described in the paragraph.

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